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Abstract

Silver containing glasses in the P2O5 - Ga2O3 - Na2O ternary diagram have been investigated to relate the effect of glass network structure and sodium ions concentration to spectroscopic and laser-writing properties of the materials. The first and most striking evidence is the large gain in the photosensitivity of fluorescent molecular silver clusters, and thus three-dimensional laser-induced patterns, from the meta-phosphate to the pyro-phosphate and ortho-phosphate glass compositions. This effect has been related to the progressive increase of the initial silver pairing quantity considering the shortening of the phosphate chains and the increase of the sodium ions concentration. One believes the presented detailed consideration of structure/property relationship will impact the design of new photosensitive glasses applied to the laser-manufacturing of components for photonic integrated circuits.

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Fig. 3 (a) Excitation and emission spectra of GPN15:Ag glass (b) Emission spectra of both isolated Ag+ ions and Ag+-Ag+ dimers with a selective excitation of the isolated Ag+ ions at 220 nm and (c) Selective excitation spectra of Ag+-Ag+ dimers for an emission at 380 nm in GPN15:Ag series. The inset shows the normalized excitation spectra of Ag+-Ag+ dimers for an emission at 380 nm in GPNx:Ag series.

Fig. 5 Corrected spectral fluorescence emissions of photo-induced structures under laser diode excitation at 405 nm for three relevant compositions: (a) meta-phosphate GPN15:Ag; (b) pyro-phosphate GPN26:Ag; (c) ortho-phosphate GPN51:Ag; (d) comparison of these three samples inscribed with 9.5TW.cm−2 at 25µm.s−1 (note that × 22 means that the absolute amplitude of the corresponding spectrum was multiplied by 22 to obtain the same normalized amplitude as that of the × 1 spectrum).

Fig. 6 Evolution of the integrated fluorescence imaging of all the photo-induced structures as a function of the velocity and irradiance for three typical glass compositions and associated structures (a) Meta-phosphate GPN15:Ag (b) Pyro-phosphate GPN26:Ag and (c) Ortho-phosphate GPN51:Ag.